A5043530718- Photochemistry and Electron Transfer Studies
- Radical Photochemical Reactions
- Quantum Dots Synthesis And Properties
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced Photocatalysis Techniques
- Porphyrin and Phthalocyanine Chemistry
- Nanoplatforms for cancer theranostics
- Perovskite Materials and Applications
- Molecular Junctions and Nanostructures
- Advanced biosensing and bioanalysis techniques
- Luminescence and Fluorescent Materials
- Sulfur-Based Synthesis Techniques
- Luminescence Properties of Advanced Materials
- Spectroscopy and Quantum Chemical Studies
- Molecular Sensors and Ion Detection
- Gold and Silver Nanoparticles Synthesis and Applications
- 2D Materials and Applications
- Organic Electronics and Photovoltaics
- Catalytic C–H Functionalization Methods
- Chalcogenide Semiconductor Thin Films
- Micro and Nano Robotics
- Electrochemical Analysis and Applications
- Conducting polymers and applications
- Advanced Fluorescence Microscopy Techniques
Nanyang Technological University
2015-2024
The University of Melbourne
1996-2007
KU Leuven
2006-2007
University of Oxford
2007
Max Planck Institute for Polymer Research
2007
Los Alamos National Laboratory
2007
University of Saskatchewan
2002-2006
Carnegie Mellon University
2006
Adam Mickiewicz University in Poznań
2004
Max Planck Society
2001-2002
Abstract The slow bimolecular recombination that drives three-dimensional lead-halide perovskites’ outstanding photovoltaic performance is conversely a fundamental limitation for electroluminescence. Under electroluminescence working conditions with typical charge densities lower than 10 15 cm −3 , defect-states trapping in perovskites competes effectively the radiative recombination. Herein, we overcome this using van-der-Waals-coupled Ruddlesden-Popper perovskite multi-quantum-wells....
The development of precision nanomedicines to direct nanostructure-based reagents into tumour-targeted areas remains a critical challenge in clinics. Chemical reaction-mediated localization response tumour environmental perturbations offers promising opportunities for rational design effective nano-theranostics. Here, we present unique microenvironment-sensitive strategy peptide-premodified upconversion nanocrystals (UCNs) within areas. Upon tumour-specific cathepsin protease reactions, the...
Abstract Platinum‐based drugs are among the most active antitumor reagents in clinical practice; their application is limited by side effects and drug resistance. A novel personalized near‐infrared (NIR) light‐activated nanoplatform obtained combining a photoactivatable platinum(IV) prodrug caspase imaging peptide conjugated with silica‐coated upconversion‐luminescent nanoparticles (UCNPs) for remote control of platinum activation, simultaneously real‐time apoptosis induced activated...
Monolayer WS2 (1L-WS2), with a direct band gap, provides an ideal platform to investigate unique properties of two-dimensional semiconductors. In this work, light emission 1L-WS2 triangle has been studied by using steady-state, time-resolved, and temperature-dependent photoluminescence (PL) spectroscopy. Two groups triangles have grown chemical vapor deposition, which exhibit nonuniform uniform PL, respectively. Observed PL features, i.e., quenching blue-shift in certain areas, are caused...
Since the seminal work of Zhang in 2016, donor–acceptor cyanoarene-based fluorophores, such as 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN), have been widely applied photoredox catalysis and used excellent metal-free alternatives to noble metal Ir- Ru-based photocatalysts. However, all reported reactions involving this chromophore family are based on harnessing energy from a single visible light photon, with limited range redox potentials −1.92 +1.79 V vs SCE. Here, we...
The electrochemical nitrogen reduction reaction (NRR) offers a sustainable solution towards ammonia production but suffers poor performance owing to preferential catalyst-H formation and the consequential hydrogen evolution (HER). Now, Pt/Au electrocatalyst d-band structure is electronically modified using zeolitic imidazole framework (ZIF) achieve Faradaic efficiency (FE) of >44 % with high yield rate >161 μg mgcat-1 h-1 under ambient conditions. strategy lowers position weaken H adsorption...
A simple, green and cost-effective approach has been reported to synthesize high-quality graphene oxide (GO) flakes via electrochemical exfoliation of pencil cores in aqueous electrolytes. The exfoliated GO exhibit excellent electrocatalytic activity toxicity tolerance for oxygen reduction reactions alkaline solution. Our present results are promising scaled-up preparation further commercialization a low-cost environmentally friendly way.
Though the SERS effect based on pristine MoS2 is hardly observed, however, plasma treated nanoflakes can be used as an ideal substrate for surface enhanced Raman scattering. It proved that structural disorder induced generation of local dipoles and adsorption oxygen nanosheets are two basic important driven forces enhancement signals adsorbed R6G molecules. As a service to our authors readers, this journal provides supporting information supplied by authors. Such materials peer reviewed may...
Here, a set of novel and personalized nanocarriers are presented for controlled nucleus‐targeted antitumor drug delivery real‐time imaging intracellular molecule trafficking by integrating an enzyme activatable cell penetrating peptide (CPP) with mesoporous silica coated quantum dots nanoparticles. Upon loading drug, doxorubicin (DOX) further exposure to proteases in tumor environment, the enzymatic cleavage sequence activates oligocationic TAT residues on QDs@mSiO2 surface direct DOX into...
Ultralow-threshold two-photon pumped amplified spontaneous emission (2ASE) and lasing in seeded CdSe/CdS nanodot/nanorod heterostructures is demonstrated for the first time. Such allow independent tunability of absorption (2PA) cross-section (σ2) through varying CdS rod size, that wavelength CdSe dot size. With an enhanced σ2, 2ASE these achieved with ultralow threshold fluence ∼1.5 mJ/cm2, which as much one order less than required spherical semiconductor NCs. Importantly, by exploiting...
As a single-element nanomaterial, sulfur nanodots are emerging as kind of heavy-metal-free nanomaterials which believed to excel over traditional undesirable compound semiconductor nanocrystals in practical applications. Attaining their potential shall rest on the facile fabrication high quality samples. Yet, so far reported techniques for fluorescent have been time-consuming and cost-ineffective. Instead, we employed strategy hydrothermal reaction synthesize nanodots, reduces synthesis time...
Polysulfide anions are endowed with unique redox properties, attracting considerable attentions for their applications in alkali metals–sulfur batteries. However, the employment of these anionic species catalysis small molecule synthesis remains underdeveloped due to moderate–poor electrochemical potential ground state, whereas some them characterized by photoabsorptions visible spectral regions. Herein, we disclose use polysulfide as light photoredox catalysts aryl cross-coupling reactions....
The blinking behavior of single Atto565 molecules on a glass surface is studied under air or nitrogen atmospheres using confocal microscopy. broad distributions for both on- and off-time durations obey power law kinetics that are rationalized charge tunneling model. In this case, transferred from the molecule to localized states found surface. Subsequent recombination by back trap cation (i.e., dark state) restores fluorescence. distribution independent excitation intensity (I), whereas...
A simple and specific divalent vancomycin–porphyrin has been developed. This conjugate indicates promising properties in fluorescent imaging photodynamic inactivation of vancomycin-sensitive vancomycin-resistant enterococci (VRE) bacterial strains.
A hydrogen-bonded organic framework derived from a polyhedral oligomeric silsesquioxane and an aggregation-induced emission luminogen tetraphenylethene derivative was reported.
Abstract Platinum‐based drugs are among the most active antitumor reagents in clinical practice; their application is limited by side effects and drug resistance. A novel personalized near‐infrared (NIR) light‐activated nanoplatform obtained combining a photoactivatable platinum(IV) prodrug caspase imaging peptide conjugated with silica‐coated upconversion‐luminescent nanoparticles (UCNPs) for remote control of platinum activation, simultaneously real‐time apoptosis induced activated...
The single-molecule fluorescence blinking behavior of the organic dye Atto647N in various polymer matrixes such as Zeonex, PVK, and PVA well aqueous media was investigated. Fluorescence with off-times millisecond to second time range is assigned radical ions formed by photoinduced electron transfer reactions from or environment. In Zeonex measured off-time distributions show power law dependence, whereas, PVA, no dependence observed. Rather, this polymer, can be best fitted monoexponential...
Femtosecond optical pump–probe spectroscopy is employed to elucidate the band-selective ultrafast carrier dynamics of few-layer MoS2. Following narrowband resonant photoexcitation exciton A transition, subpicosecond picosecond relaxation electron and hole at K valley are separately interrogated by a broadband probe pulse. The temporal evolution spectral first moment reveals nonexponential intravalley in conduction band. Fluence dependence measurements suggest that this process predominantly...
Current anticancer chemotherapy often suffers from poor tumor selectivity and serious drug resistance. Proper vectors for targeted delivery controlled release play crucial roles in improving the therapeutic to areas also overcoming resistance of cancer cells. In this work, we developed a novel human serum albumin (HSA) protein-based nanocarrier system, which combines photoactivatable Pt(IV) antitumor prodrug realizing fluorescent light-up probe evaluations action efficacy. The constructed...
In this study, unique methyl-functionalized derivatives (T*PP+) of the drug carrier triphenylphosphonium (TPP+) that exhibit significant enhancement accumulation both cation and its conjugated cargo in cell mitochondria are designed. We show presence methyl group(s) at key positions within phenyl ring results an increase hydrophobicity solvent accessible surface area T*PP+. particular, when para position T*PP+ is functionalized with a group, most exposed to surrounding environment, leading...
Currently, the most popular molecular photosensitizers used for synthetic organic chemistry and energy applications are still noble-metal-based ruthenium iridium complexes that usually require expensive metal ligand precursors. In contrast, bis(arylimino)acenaphthene (Ar-BIAN) is an established redox noninnocent π-accepting easily assembled in one condensation step from affordable commercially available Herein, we have developed a series of Ar-BIAN CuI as visible-light-harvesting...